JPH09152232A - Refrigerant tube for conditioner and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the sufficient strength against the pressure resistance and bending stress by the sufficient absorption of the vibration of a refrigerant tube by covering the outer surface of the welded part of the uneven part of a flexible tube formed in bellows state to the refrigerant tube with an elastic member having an uneven inner surface corresponding to the uneven part and cylindrical outer surface without gap. SOLUTION: The first valve of the outdoor unit of the air conditioner is connected to a compressor via a suction tube 4, and an accumulator and flexible tube 9 are provided in series on the way of the tube 4. The tube 9 is formed of stainless bellows tube, and connected to the tube 4 as a refrigerant tube via a welded part 18. An elastic member 20a of a urethane rubber is filled in and brought into close contact with the outsides of the bellows-like uneven part 19 of the tube 19 and welded part 18 to form the outsides flat. Thus, the tube 9 is reinforced without losing the flexibility, the strength and vibration absorbing properties are improved against the pressure resistant bending stress, and the corrosion of the part 18 is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner, and more particularly to a refrigerant pipe for an outdoor unit of an air conditioner and a manufacturing method thereof.

[0002]

2. Description of the Related Art Generally, a compressor of an outdoor unit of an air conditioner and a connecting pipe between an outdoor heat exchanger and an indoor heat exchanger, that is, a suction pipe to the compressor and a discharge pipe from the compressor are equipped with a compressor. A vibration absorber is provided to prevent the vibration from being transmitted to each heat exchanger.

FIG. 15 shows, for example, the actual exploitation Sho 61-54163.
It is a perspective view which shows the conventional piping structure shown by the publication.
In the figure, reference numeral 1 is a compressor, which is elastically supported on the base of the device via a vibration isolator 2, and a switching valve 3 such as a four-way valve is arranged above it. Reference numeral 4 is a suction pipe connecting the switching valve 3 and the compressor 1, and an accumulator 5 is connected midway. 6 is a discharge pipe connecting the compressor 1 and the switching valve 3, 7 and 8 are suction pipes and discharge pipes, which connect the switching valve 3 and a heat exchanger (not shown), and connect these pipes. Each is bent in a loop around the compressor 1.

Next, the operation will be described. When the compressor 1 is driven to compress and discharge the refrigerant, the compressor 1 vibrates. Therefore, this vibration is propagated through the suction pipe 4 and the discharge pipe 6, and reaches the heat exchanger through the switching valve 3 such as a four-way valve. However, since each refrigerant pipe is bent around the compressor 1 in a loop shape, a vibration damping action is performed and the vibration is gradually attenuated.

In such a conventional piping structure, the number of loops formed in the piping is increased, the length of the piping is increased, and the vibration resistance of the refrigerant is increased. Had the problem of becoming larger.

Further, as the number of loops formed in the pipe increases, the number of natural frequencies of the piping system also increases, and depending on the operating speed of the compressor, the operating speed of the compressor and the natural frequency of the piping system match. In the worst case, the vibration became large and the piping was damaged. In particular, when controlling the frequency of the compressor input power to change the operating speed of the compressor, if there are many loops formed in the pipe, the resonance frequency will also increase, so the design of the pipe shape and the compressor Is very difficult to control.

As a second conventional example for solving such a problem, a flexible tube 9 formed of a soft adjacent deoxidized copper tube is provided, and the flexible tube 9 is cast into the outer peripheral portion in the longitudinal direction. A spiral groove 10 formed in a bellows shape along with and formed of a material having higher rigidity than the soft copper phosphate tube, and allows the flexible tube 9 to bend in the axial or longitudinal direction, and A technique for restricting radial bending or deformation due to pressure to enhance the durability of the flexible tube 9 as much as possible is disclosed in FIGS. 16 to 18.

Next, the operation will be described. The refrigerant compressed by the compressor 1 is discharged and transferred to the discharge pipe 6 connected to it. The refrigerant is compressed and reaches the switching valve 3 such as a four-way valve through the discharge pipe 6 and the suction pipe 4, and is further propagated to the discharge pipe 8 and the suction pipe 7. Since the flexible tube 9 is interposed in the tube 7, vibration is absorbed by the flexible tube 9.

Therefore, the vibration from the compressor 1 is prevented from being absorbed by the flexible tube 9 and propagating to the outdoor heat exchanger (not shown). The flexible tube 9 is formed of a soft adjacent deoxidized copper tube, and a spiral groove 10 is provided in the outer peripheral portion along the axial direction, and a coil spring 11 is loosely fitted, so that the flexible tube 9 can expand and contract in the axial direction. And the deformation in the radial direction is restricted, and the pressure resistance and fatigue strength are increased to improve the durability.

As a third conventional example, a wire mesh is arranged on the outer circumference of a flexible tube made of metal, and the outside thereof is covered with a cylindrical body having a thinned central portion, which is made of metal by vibration. Japanese Patent Laid-Open No. 63-75453 discloses a technique for controlling the bending posture of the bellows tube to extend the life of the bellows tube.

Further, FIG. 19 shows, for example, Japanese Patent Application Laid-Open No. 4-1721.
7 is a perspective view showing a conventional brazing method shown in Japanese Patent No. 75, where 4a is an insertion side suction pipe for brazing, 4b is a suction side suction pipe for brazing, and 12 is an end of a pipe to be connected. A ring-shaped brazing material fitted into the portion, 13 is an electrode for high-frequency induction heating at the time of high-frequency brazing for heating the ring-shaped brazing material portion.

Next, the operation of the conventional brazing method will be described. The ring-shaped brazing material 12 is fitted into the end of the pipe 9, and this end is inserted and connected to the end of the pipe 6b. Then, the connecting part is brought close to the heating electrode 13, and the high-frequency induction current flowing through the heating electrode causes the connecting part. Is heated to melt the brazing material 12, so that the pipes are brazed together by high frequency wave.

[0013]

However, in the conventional refrigerant pipe for an air conditioner, since the flexible pipe is a soft adjacent deoxidized copper pipe as shown in FIGS. 16 to 18, it is reinforced by a coil spring. However, the strength is insufficient for use in an air conditioner, work hardening occurs due to aging due to vibration, and a sufficient flexible tube cannot be obtained.

Further, when pressure is applied to the flexible tube, it changes in the axial direction rather than the radial direction due to the reinforcement by the coil spring, and therefore the deformation due to the internal pressure becomes large. Further, although the vibration of the pipe of the air conditioner is originally larger in the bending direction than in the axial direction, the conventional example does not take sufficient measures against the bending vibration. There was a problem of destruction.

Further, in the above-mentioned third conventional example, since there is a gap space between the concavo-convex portion of the flexible tube and the cylindrical body, when a deforming force such as bending acts, a valley portion or a mountain portion of the bellows. There is a problem that the stress is locally concentrated on the surface, and it is difficult to disperse the stress sufficiently.Furthermore, since the central part of the rubber tubular body is thinned, cracks may occur in the central part for some reason. Since it easily breaks when it enters, it was not perfect in terms of reliability.

Further, since the conventional manufacturing method is constructed as described above, the piping becomes hot due to the brazing. Therefore, there is a problem in that it cannot be applied to piping parts that are vulnerable to heat such as a flexible tube using rubber as a component.

The present invention has been made to solve the above problems, and sufficiently absorbs vibrations of a refrigerant pipe connected to a compressor of an air conditioner to withstand pressure and sufficient strength against bending stress. An object of the present invention is to provide an air conditioner to which a refrigerant pipe having the above is attached at a constant cost.

It is another object of the manufacturing method of the present invention to obtain a method capable of manufacturing a flexible pipe which is weak against heat and which is a high-quality refrigerant pipe with little thermal deterioration.

[0019]

A refrigerant pipe for an air conditioner according to the present invention is an air conditioner in which a flexible pipe is connected in series in the middle of a refrigerant pipe connected between a compressor and an outdoor unit. In the refrigerant pipe for use, the outer surface of the concavo-convex portion of the flexible tube formed in a bellows shape and the outer surface of the welded portion with the refrigerant pipe is covered with an elastic member having an inner surface of the concavo-convex portion corresponding to the concavo-convex portion and an outer surface of a cylinder without a gap. I have a good morning.

In the refrigerant pipe for an air conditioner according to the present invention, the divided body along the longitudinal direction of the sleeve having the inner surface of the uneven portion opposed to the outer surface of the uneven portion of the flexible tube is provided outside the uneven portion of the flexible tube. It is installed by fitting.

In the refrigerant pipe for an air conditioner according to the present invention, a flexible pipe formed in a bellows shape and a cushioning material are provided without a gap and are in close contact with each other.

The refrigerant pipe for an air conditioner according to the present invention has a space between a flexible pipe formed in a bellows shape and an elastic sleeve concentrically arranged outside the flexible pipe. A cushioning body made of a low-elasticity member is provided tightly to the outer elastic sleeve without any gap.

A refrigerant pipe for an air conditioner according to the present invention is provided in a clearance space between a flexible pipe formed in a bellows shape and an elastic sleeve concentrically arranged outside the flexible pipe. A cushioning body is provided without a gap and is in close contact, and a reinforcing mesh is provided inside or on the outer peripheral portion of the elastic member.

In the refrigerant pipe for an air conditioner according to the present invention, a buffer body made of a low elastic member is provided tightly and closely to the outer elastic sleeve.

In the refrigerant pipe for an air conditioner according to the present invention, the sleeve has a rectangular cross section and has elastic directionality.

The refrigerant pipe for an air conditioner according to the present invention is formed in a bellows shape in an air conditioner in which a flexible pipe is connected in series in the middle of the refrigerant pipe connected between the compressor and the switching valve. The cushioned material is tightly fitted in the space between the flexible tube and the sleeve arranged in a rectangular cross section with a space outside the flexible tube, and the sleeve has elastic directionality. ing.

In the method for manufacturing a refrigerant pipe for an air conditioner according to the present invention, when the flexible pipe and the refrigerant pipe connected to the flexible pipe are brazed and welded, a ring-shaped brazing material is fitted and mounted in the flexible pipe. After this end is inserted and connected to the end of the refrigerant pipe connected to the flexible pipe, the brazing material is attached and fixed, and then brazing and welding by the high-frequency brazing method while ejecting an inert gas into the refrigerant pipe. After the brazing and welding, air is jetted into the refrigerant pipe.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 shows a refrigerant pipe around a compressor of an outdoor unit of an air conditioner of the present invention, FIG. 2 is an enlarged view showing a cross section of a flexible pipe, and 14 is an outdoor unit base of the air conditioner, The vibration isolator 2 elastically mounts and supports the compressor 1. Reference numeral 15 is a first valve of this outdoor unit, which is connected to the compressor 1 by a suction pipe 4.
An accumulator 5 and a flexible tube 9 are provided in series on the way. An outdoor heat exchanger 16 is connected to the compressor by a discharge pipe 6. Reference numeral 17 is a stainless steel bellows tube of the flexible tube 9, which is a suction pipe 4 as a refrigerant pipe.
Are connected to each other by a welding portion 18. Reference numeral 19 denotes a bellows-like uneven portion, and an elastic member 20 such as urethane rubber is filled on the outside of the uneven portion and the welded portion 18 and is in close contact therewith,
The outside is smooth and flat like a cylinder.

Next, the operation will be described. 1 and 2
At, the compressor 1 and the vibration propagate through the accumulator 5 and the suction pipe 4 as the refrigerant pipe, and reach the flexible pipe 9. However, the vibration is considerably smaller than the vibration generated in the compressor 1. Therefore, the vibration of the outdoor unit of the air conditioner is significantly reduced as compared with the outdoor unit that does not use the flexible tube 9, as shown in FIG. 11. Also,
When the flexible tube 9 is filled with a refrigerant, an expansion in the axial direction occurs, but stress concentration occurs due to deformation of only the bellows tube 17 made of stainless steel, and plastic deformation or destruction occurs. The elastic member 20 made of urethane rubber provided on the outside of the bellows-like concavo-convex portion 19 with no gap allows the stress to be dispersed in a specific portion without being concentrated, and the expansion of the flexible tube 9 can be regulated.

Regarding the deformation in the bending direction, the elastic member 20 made of urethane rubber can provide sufficient flexibility necessary for absorbing vibration. Therefore, the vibration of the compressor 1 is absorbed by the flexibility in the bending direction while maintaining the pressure resistance against the fluid pressure. Further, due to the internal damping of the elastic member 20 made of urethane rubber, the vibration damping ratio at the time of vibration is increased, and the flexible tube 9
It has the same effect as installing a vibration damper. Therefore, in the first embodiment of the present invention, the length of the refrigerant pipe can be shortened and the space for disposing the refrigerant pipe can be reduced, so that the outdoor unit can be downsized. Further, since the welded portion 18 is also covered with the elastic member 20 made of urethane rubber, the welded portion 18 can be shielded from moisture in the outside air and other substances that shorten the service life, and corrosion can be prevented.

In the first embodiment of the present invention, the flexible pipe is specified as the suction pipe, but the flexible pipe may be connected in series to the discharge pipe or both the discharge pipe and the suction pipe. Furthermore, although urethane rubber is specified as the elastic member, the same effect can be obtained by using styrene rubber, silicon rubber, or the like.

Embodiment 2 FIG. 3 and 4 are an exploded side view and a schematic side view of a flexible tube according to a second embodiment of the present invention. Reference numeral 20a denotes a two-divided body divided along the longitudinal direction of a rubber sleeve. It has an inner surface of the uneven portion 19 that opposes the uneven portion 19, and is fitted to the outside of the uneven portion 19 in a close contact state without a gap.

Next, the operation will be described. When the flexible tube 9 is filled with a refrigerant and an internal pressure is applied, axial expansion of the flexible tube 9 is suppressed by a rubber sleeve, for example, a urethane rubber 20 which is an elastic member. The stress of 9 is dispersed without being concentrated in a specific portion, and the pressure resistance of the flexible tube 9 can be improved. Further, the stress due to the vibration is dispersed by the urethane rubber 20 which is an elastic member, so that the stress concentration due to the vibration can be avoided and the destruction can be prevented. Further, due to the internal damping of the elastic member 20 made of urethane rubber, the vibration damping ratio at the time of vibration is also increased, and the same effect as when a vibration damper is attached to the flexible tube is obtained. Therefore, the length of the refrigerant pipe can be shortened, the space for arranging the refrigerant pipe can be small, and the unit can be downsized, and the divided body can be mass-produced at low cost by a mold, and the assembly work is easy and cost-effective. Has the effect of lowering the

Although urethane rubber is specified as the elastic member in the second embodiment, the same effect can be obtained by using styrene rubber, nitrile rubber, chloroprene rubber, silicon rubber or the like. Further, the divided body may be divided into three or four.

Furthermore, in the second embodiment, the flexible pipe is specified as the suction pipe, but the flexible pipe may be connected in series to the discharge pipe or both the discharge pipe and the suction pipe. Furthermore, in the second embodiment of the present invention, the outer side has a cylindrical shape, but it is needless to say that it may be a bellows.

Embodiment 3 FIG. FIG. 5 shows Embodiment 3 of the present invention.
FIG. 6 is a side view showing the outline of the flexible tube, and FIG. 6 is an explanatory view showing the manufacturing process of this flexible tube. In FIG. 6, a flexible pipe 9 made of stainless steel, which is welded to the suction pipe 4 as a refrigerant pipe, is concentrically provided with a sleeve 21 made of, for example, nitrile rubber, which is larger than the outer diameter of the flexible pipe 9 in advance. When a buffer material, for example, a liquid urethane rubber 20 mixed with a chain extender and a cross-linking agent is injected into the space between the flexible tube 9 and the sleeve 21 made of nitrile rubber, and cured, the nitrile rubber is obtained as shown in FIG. It is possible to obtain the elastic member 20 made of urethane rubber provided in the space between the sleeve 21 and the sleeve 21 without any space.

Next, the operation will be described. When the flexible tube 9 is filled with a refrigerant and an internal pressure is applied, the expansion of the flexible tube 9 is suppressed by the sleeve 21 made of nitrile rubber and the elastic member 20 made of urethane rubber, and the stress of the flexible tube 9 is specified. The flexible tube 9 is dispersed without being concentrated in a portion, and the pressure resistance of the flexible tube 9 can be increased. Further, the stress due to vibration is also dispersed by the elastic member 20 made of urethane rubber and the sleeve 21 made of nitrile rubber, so that stress concentration and breakage due to vibration can be prevented. Further, by designing the elastic member 20 made of urethane rubber and the sleeve 21 made of nitrile rubber, the flexible tube 9 necessary for absorbing vibration can be reinforced. Furthermore, due to the internal damping of the elastic member 20 made of urethane rubber and the sleeve 21 made of nitrile rubber, the vibration damping ratio at the time of vibration also rises, and the same effect as when a vibration damper is attached to the flexible tube 9 is obtained. Therefore, the length of the refrigerant pipe can be shortened,
Moreover, since the space for disposing the refrigerant pipe is small, the unit can be downsized.

Further, in the third embodiment of the present invention, the urethane rubber filling can be obtained by injecting the liquid urethane rubber according to the shape and size of the flexible tube.
It is possible to obtain a low-cost flexible tube that can be manufactured by using a terminal seal member and has excellent pressure resistance and vibration absorption, without requiring a large mold, thus providing a low-cost air conditioner. can do.

Further, although urethane rubber and nitrile rubber are specified in the third embodiment of the present invention, the same effect can be obtained by substituting styrene rubber, chloroprene rubber, butyl rubber, or silicone rubber. .

Embodiment 4 FIG. In the third embodiment, the gap between the flexible tube and the sleeve 21 made of nitrile rubber and concentrically arranged outside the flexible tube is formed of the urethane rubber filling, In Embodiment 4 of the present invention, the hardness of the nitrile rubber sleeve 21 is set to be harder than the hardness of the urethane rubber 20, and the normal rubber hardness is
It is selected in the range of 50 to 80 degrees.

As a result, the nitrile rubber sleeve 21 is formed.
Thus, the deformation of the flexible tube 9 under pressure load can be regulated and the pressure resistance can be increased. Also, the urethane rubber 2 injected inside
When 0, vibration absorption can be improved. Further, by appropriately selecting the hardness ratio of the nitrile rubber sleeve 21 and the urethane rubber 20 injected inside, it can be used in a wide range of conditions.

Embodiment 5 FIG. In the above-described Embodiment 3 or Embodiment 4, the flexible tube 9 made of stainless steel and the nitrile rubber sleeve 21 concentrically arranged outside the flexible tube 9 are of a cylindrical bottomless type. But Figure 7
As shown in FIG. 7, the elastic member 20 made of urethane rubber is provided in the space between the flexible tube 9 and the bottomed nitrile rubber sleeve 21a.
Are formed without any gaps.

In the fifth embodiment of the present invention, since the terminal sealing member can be eliminated, the production process is reduced, a low-cost flexible tube can be obtained, and a low-cost air conditioner is provided. It has the effect of being able to

Embodiment 6 FIG. FIG. 8 shows the sixth embodiment.
It is a side sectional view showing an outline of a flexible tube of. As shown in FIG. 8, a flexible pipe 9 made of stainless steel, which is welded to the suction pipe 4 as a refrigerant pipe, is previously reinforced with a mesh larger than the outer diameter of the flexible pipe 9 such as a mesh 22 made of rubber. A sleeve 21 made of nitrile rubber is concentrically arranged, and a raw material in which a chain extender and a crosslinking agent are mixed with liquid urethane rubber 20 which is an elastic member is injected into a space between the flexible tube 9 and the sleeve 21 made of nitrile rubber. Then, when cured, a filling material of the elastic member 20 made of urethane rubber is provided in the space between the nitrile rubber sleeve 21 and the flexible tube 9 without any space.

Next, the operation will be described. When the flexible tube 9 is filled with the refrigerant and the internal pressure is applied, the expansion of the flexible tube 9 is suppressed by the nitrile rubber reinforced by the rubber mesh 22, and the stress is concentrated on a specific portion of the flexible tube 9. Without being dispersed, the pressure resistance of the flexible tube 9 can be improved. Further, since the sleeve 21 made of nitrile rubber is reinforced by the mesh 22 made of rubber, the sleeve 21 made of nitrile rubber and the urethane rubber 2 of the third and fourth embodiments are provided.
It is possible to obtain a higher pressure resistance than the structure in which 0s are combined.

Further, the stress due to vibration is also caused by the urethane rubber 20.
Dispersed by, it is possible to prevent stress concentration and damage due to vibration. Further, due to the internal damping of the urethane rubber 20, the vibration damping ratio at the time of vibration also rises, and the same effect as when a vibration damper is attached to the flexible tube 9 is obtained. Therefore, the length of the refrigerant pipe can be shortened, the space for arranging the refrigerant pipe can be small, and the unit can be downsized. Further, in the sixth embodiment, the urethane rubber 20 is injected by injecting the liquid urethane rubber 20 in accordance with the shape and size of the flexible tube 9.
Since it is possible to obtain the filling material and to manufacture without requiring a large mold, it is possible to obtain a low-cost flexible tube excellent in pressure resistance and vibration absorption, and a low-cost air conditioner. Can be provided.

Embodiment 7 FIG. FIG. 9 shows the seventh embodiment.
FIG. 3 is a perspective view schematically showing a nitrile rubber sleeve that constitutes a part of the flexible tube of FIG. Reference numeral 23 denotes a nitrile rubber sleeve having a rectangular cross section, which is arranged concentrically with the flexible tube 9 in the third, fourth, fifth, or sixth embodiment and the outside thereof with a space therebetween. Unlike the sleeve 21 made of nitrile rubber, it has an elastic direction.

Next, the operation will be described. With respect to the vibration of the compressor, when the vibration in the connecting direction is 1, the vibration in the normal line or in the vertical direction is about 0.05, which is negligible. As described above, if the compressor 1 has flexibility in only one direction, the vibration generated in the compressor 1 is damped, and the vibration of the outdoor unit of the air conditioner is as apparent from the unit vibration level comparison shown in FIG. The effect is obtained, and it can be significantly reduced as compared with an outdoor unit that does not use a flexible tube. In addition, it is sufficient if it has enough flexibility in the necessary direction to absorb the vibration of the compressor, so when it is subjected to external vibration such as during transportation,
With the configuration of the seventh embodiment, unnecessary vibration can be suppressed, so that the influence on other refrigerant piping components can be reduced and the reliability of the outdoor unit can be improved.

When the flexible tube 9 is filled with the refrigerant,
Although elongation in the axial direction occurs, stress concentration occurs due to deformation only in the flexible tube 9 made of stainless steel, and plastic deformation or destruction occurs. However, the urethane rubber 20 provided outside the concave-convex portion 17 of the flexible tube 9 allows the stress to be dispersed in a specific portion without being concentrated, so that the expansion of the flexible tube 9 can be regulated. With respect to the bending direction, the urethane rubber 20 provides sufficient flexibility necessary for absorbing vibration. Therefore, the vibration of the compressor 1 is absorbed by the flexibility in the bending direction while maintaining the pressure resistance.

Embodiment 8. 10 is a refrigerant piping diagram around the compressor of the outdoor unit of the air conditioner, and FIG. 11 is FIG.
12 is a top view of No. 0, and FIG.
Sectional drawing which shows the flexible tube of FIG. FIG. 12 (b) is a side view showing the outline of the flexible tube of the eighth embodiment. In the figure, 1
Reference numeral 4 denotes an outdoor unit base of the air conditioner, on which the compressor 1 is elastically mounted and supported by the vibration isolator 2, and the compressor 1
Is connected to a switching valve 3 such as a four-way valve via an accumulator 5 by a suction pipe 4. Further, the compressor 1 and the switching valve 3 such as a four-way valve are connected by a discharge pipe 6. Further, the switching valve 3 such as a four-way valve has a suction pipe 7 and a discharge pipe 8 connected to a heat exchanger (not shown).
Is connected. Reference numeral 17 denotes a stainless bellows tube of the flexible tube 9, which is connected to a suction pipe 4 as a refrigerant pipe by a welded portion 18. 19 is an uneven portion on the bellows, 2
Reference numeral 3 denotes a nitrile rubber sleeve having a rectangular cross section, which is arranged so as to enclose the flexible tube 9 formed by the above-mentioned stainless bellows tube 17. The sleeve 1 has a short connecting direction of the compressor 1 and a long normal direction. A closed surface 23c is formed on one side of the flexible tube 9, and the gap between the flexible tube 9 and the bellows-shaped uneven portion 19 is filled with a urethane rubber 20 which is an elastic member without any gap.

Next, the operation will be described. The vibration of the compressor 1 propagates through the accumulator 5 and reaches the flexible tube 9. As shown in FIG. 11, when the vibration of the compressor 1 is tangential, that is, the vibration in the direction of large vibration of the compressor 1 is 1, the vibration in the normal direction or in the vertical direction, that is, in the direction of small vibration of the compressor is about 0. .0
Since it is so small as to be negligible, the arrow direction of a is a direction of great flexibility, and the arrow direction of b is a direction of small flexibility.
If it has flexibility in only one direction, the vibration generated in the compressor 1 is damped, and the vibration of the outdoor unit of the air conditioner has almost the same effect as the unit vibration level comparison table shown in FIG. It can be significantly reduced compared to an outdoor unit that does not use a flexible tube.

Therefore, in the eighth embodiment of the present invention, the flexible pipe is connected in series in the middle of the refrigerant pipe connected between the compressor and the switching valve such as the four-way valve, and the connecting direction to the compressor is In other words, the direction in which the vibration of the compressor is large has a rectangular cross section, and the normal or up-down direction of the compressor, that is, the direction of small vibration of the compressor is a rectangular cross section. Since it has an elastic direction, the flexible tube can be reinforced without losing the flexibility of bending in the necessary direction, and the pressure resistance, strength against bending stress, and vibration absorption can be improved, Since the length of the refrigerant pipe can be shortened and the space for arranging the refrigerant pipe can be reduced, the unit can be downsized.

Furthermore, since a filling material that is an elastic member such as urethane rubber can be obtained by injecting liquid urethane rubber in accordance with the shape and size of the flexible tube, a large mold is not required, A flexible tube that can be easily manufactured using a terminal sealing member and has excellent pressure resistance and vibration absorption can be obtained at low cost, and has an effect of providing a low-cost air conditioner. .

Further, in the eighth embodiment of the present invention, since it is sufficient that the compressor has flexibility enough to absorb the vibration of the compressor in the necessary direction, it is possible to avoid the vibration of disturbance during transportation. Since unnecessary vibration can be suppressed, it is possible to reduce the influence on other refrigerant piping parts and to improve the reliability of the unit.

Further, in the eighth embodiment of the present invention, the flexible pipe is used as a part of the suction pipe, but the flexible pipe is connected in series to the discharge pipe or both the discharge pipe and the suction pipe. Good.

Embodiment 9 FIG. Hereinafter, a ninth embodiment of the present invention will be described with reference to the drawings. In FIG. 14, 9 is a flexible tube according to the first to eighth embodiments, 4 is a pipe connected to the flexible tube 9, and 12 is a ring-shaped brazing fitting at the end of the flexible tube 9. Material, 13 is an electrode for high frequency induction heating during high frequency brazing, 24 is an inert gas nozzle for ejecting an inert gas into the pipe, and 25 is air for ejecting cooling air toward the flexible tube 9 after completion of the high frequency brazing. It is a nozzle. The flexible tube 9 has a cylindrical rubber portion 20a in appearance.
The suction pipe 4 is attached to both ends of the rubber part 20a, and the rubber part 20a is particularly weak against heat.

Hereinafter, the operation will be described. First, the ring-shaped brazing material 12 is provided on both sides of the flexible tube 9 on the insertion side 4 of the suction pipe 4.
Fit in end a. This end is inserted and connected to the end of the suction pipe 4b on the side to be inserted. At this time, the ring-shaped brazing material 1
2 is fixed so as to hit the end surface of the suction pipe 4b. Next, the connected suction pipes 4 a and 4 b are arranged on the high frequency induction heating electrode 13. At this time, the high frequency induction heating electrode 13 is arranged around the pipe insertion connecting portion.

Next, the inert gas nozzle 24 is arranged so that the inert gas can be ejected into the suction pipe 4. First, an inert gas is ejected to fill the pipe with the inert gas. This prevents oxidation of the inner surface of the flexible tube 9 due to heat. Then, high frequency induction heating electrode 12 performs high frequency heating. As a result, only the connecting portion between the flexible pipe 9 and the suction pipe 4 is locally heated, so that the rubber portion 20a is brazed without being heated.

Immediately after brazing, the cooling air nozzle 2
Air is jetted from 5 toward the suction pipe 4 of the flexible pipe 9 until the pipe is cooled. As a result, heat transfer from the connecting portion between the brazed flexible tube 9 and the suction pipe 4 to the elastic member 20 is reduced, and the flexible tube 9 is protected.

Embodiment 10. Embodiment 9
The brazing of the flexible tube 9 has been described above, but the brazing of a device that is weak against heat has the same effect as that of the ninth embodiment. Further, by automating the high-frequency induction heating process, it is possible to reduce variations in brazing.

Embodiment 11 FIG. Further, in the ninth embodiment, the ring-shaped brazing material 12 is fitted into the end portion of the suction pipe 4a of the flexible tube 9, and the end portion of the suction pipe 4a is inserted and connected to the end portion of the suction pipe 4b. Even if the insertion side pipe 4a of 9 and the pipe 4b of the side to be inserted are connected in an opposite manner, the same effect as that of the ninth embodiment can be obtained.

[0062]

In the refrigerant pipe for an air conditioner according to claim 1 of the present invention, a flexible pipe is connected in series in the middle of the refrigerant pipe connected between the compressor and the outdoor unit. In the refrigerant pipe for a harmony machine, the outer surface of the concavo-convex portion of the flexible tube formed in a bellows shape and the welded portion with the refrigerant pipe is an elastic member having an inner surface of the concavo-convex portion corresponding to the concavo-convex portion and a cylindrical outer surface. Since it is covered without, it reinforces the flexible tube without losing its flexibility, improves strength against pressure bending stress, improves vibration absorption, and shortens the length of the refrigerant pipe.
It has an effect that corrosion or the like is less likely to occur in the welded portion.

In the refrigerant pipe for an air conditioner according to claim 2 of the present invention, the divided body along the longitudinal direction of the sleeve having the inner surface of the uneven portion which opposes the outer surface of the uneven portion of the flexible tube is the flexible tube of the flexible tube. Since it is configured to be fitted on the outer side of the uneven portion, the split body along the longitudinal direction of the pipe made of nitrile rubber having the inner surface of the uneven portion has high productivity and easy assembling work, so that the manufacturing cost is high. Has the effect of pulling down.

The refrigerant pipe for an air conditioner according to claim 3 of the present invention has a structure in which a flexible tube formed in a bellows shape and a cushioning material are provided without any gaps and are in close contact with each other. Since the cushioning material can be provided according to the size, there is an effect that the flexible tube excellent in pressure resistance and vibration absorption can be produced at a low cost by increasing productivity.

A refrigerant pipe for an air conditioner according to a fourth aspect of the present invention includes a flexible tube formed in a bellows shape, and an elastic sleeve concentrically arranged outside the flexible tube. Since a cushioning body made of a low elastic material is provided without any gap in the gap space of the outer elastic body, the cushioning material having a lower elasticity than the elastic sleeve is obtained. In addition, it has excellent pressure resistance and vibration absorption, and also has the effect of improving productivity and obtaining a low-cost flexible tube.

A refrigerant pipe for an air conditioner according to a fifth aspect of the present invention includes a flexible tube formed in a bellows shape, and an elastic sleeve concentrically arranged outside the flexible tube. Since a buffer body is provided without any gaps in the gap space, and the reinforcing member is provided inside or on the outer peripheral portion of the elastic member, the flexible tube is reinforced and pressure resistant without loss of flexibility. Properties, strength characteristics against bending stress, and vibration absorption are improved, the length of the refrigerant pipe can be shortened, the space for installing the scarlet refrigerant pipe can be reduced, and the unit can be downsized.

Since the refrigerant pipe for an air conditioner according to claim 6 of the present invention has a structure in which a cushioning member made of a low elastic member is provided closely to the outer sleeve of the elastic member and is closely adhered thereto, the elastic member It is possible to obtain a low-elasticity cushioning filler from the sleeve, and it has excellent pressure resistance and vibration absorption.
In addition, it has the effect of increasing productivity and obtaining a low-cost flexible tube.

In the refrigerant pipe for an air conditioner according to claim 7 of the present invention, the sleeve has a rectangular cross section and has elastic directionality, so that it is subjected to disturbance vibration during transportation or the like. Even in this case, unnecessary vibration can be suppressed, the influence on other refrigerant piping components can be reduced, and the reliability of the outdoor unit can be improved.

A refrigerant pipe for an air conditioner according to claim 8 of the present invention is an air conditioner in which a flexible pipe is connected in series in the middle of a refrigerant pipe connected between a compressor and a four-way valve, A cushioning material is provided tightly in the gap space between the flexible tube formed in the shape of a bellows and the sleeve arranged in a rectangular cross section with a space on the outside, and the sleeve is elastically oriented. Since the sleeve itself has an elastic direction, the flexible tube can be reinforced without losing the flexibility of bending in the necessary direction, and the pressure resistant vibration absorption Is improved, the length of the refrigerant pipe is shortened, and the space for arranging the refrigerant pipe can be reduced, so that the unit can be downsized.

In the method for manufacturing a refrigerant pipe for an air conditioner according to claim 9 of the present invention, when the flexible pipe and the refrigerant pipe connected to the flexible pipe are brazed and welded, the ring-shaped brazing material is made flexible. After fitting and fitting in the pipe, insert and connect this end to the end of the refrigerant pipe connected to the flexible pipe, fix and fix the brazing material, and then eject the inert gas into the refrigerant pipe by high frequency brazing method Since brazing welding is performed and air is blown into the refrigerant pipe after brazing welding is completed, a flexible tube that is weak against heat is protected from heat to reduce thermal deterioration and brazing with less variation. It has the effect that it can be manufactured by welding.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a refrigerant pipe for an air conditioner according to Embodiment 1 of the present invention.

FIG. 2 is a side sectional view showing a flexible tube according to Embodiment 1 of the present invention.

FIG. 3 is an exploded perspective view showing a flexible tube according to Embodiment 2 of the present invention.

FIG. 4 is a side sectional view showing a flexible tube according to Embodiment 2 of the present invention.

FIG. 5 is a third embodiment or a fourth embodiment of the present invention.
The sectional side view which shows the flexible tube by.

FIG. 6 is an explanatory diagram for manufacturing a flexible tube according to Embodiment 3 of the present invention.

FIG. 7 is a side view showing a flexible tube according to Embodiment 5 of the present invention.

FIG. 8 is a side view showing a flexible tube according to Embodiment 6 of the present invention.

FIG. 9 is a perspective view showing a sleeve of a flexible tube according to Embodiment 7 of the present invention.

FIG. 10 is a side view of essential parts showing an air conditioner refrigerant pipe according to an eighth embodiment of the present invention.

11 is a top view showing the refrigerant pipe for an air conditioner of FIG.

FIG. 12A is a front view showing a flexible tube according to an eighth embodiment of the present invention. FIG. 9B is a side view of a main portion showing a flexible tube according to Embodiment 8 of the present invention.

FIG. 13 is a relationship diagram showing a comparison of unit vibration levels when the first embodiment of the present invention is used.

FIG. 14 is a front view of a brazing state of an air conditioner refrigerant pipe according to a ninth embodiment of the present invention.

FIG. 15 is a perspective view showing a refrigerant pipe by partially cutting out an air conditioner according to a first conventional example of the present invention.

FIG. 16 is a perspective view showing a refrigerant pipe by partially cutting out an air conditioner according to a second conventional example of the present invention.

FIG. 17 is a side view showing a flexible tube according to a conventional example of the present invention.

FIG. 18 is a side sectional view showing a main part of the flexible tube of FIG.

FIG. 19 is a perspective view showing a conventional brazing method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 compressor, 3 switching valve, 9 flexible tube, 12 ring-shaped brazing material, 13 high frequency induction heating electrode, 17 bellows tube, 18 welded part, 19 uneven part, 20 elastic member, 2
1 Nitrile rubber sleeve, 22 mesh, 23
Rectangular sleeve, 24 Inert gas nozzle, 25
Air nozzle,

Claims (9)

[Claims] 1. In a refrigerant pipe for an air conditioner in which a flexible pipe is connected in series in the middle of a refrigerant pipe connected between a compressor and an outdoor unit, irregularities of the flexible pipe formed in a bellows shape. A refrigerant pipe for an air conditioner, characterized in that an outer surface of a welded portion between the portion and the refrigerant pipe is covered with an elastic member having an inner surface of a concavo-convex portion corresponding to the concavo-convex portion and an outer surface of a cylinder without a gap. 2. A divided body along a longitudinal direction of a sleeve having an inner surface of a concavo-convex portion that opposes an outer surface of the concavo-convex portion of the flexible tube is fitted on the outer side of the concavo-convex portion of the flexible tube. The refrigerant pipe for an air conditioner according to claim 1. 3. The refrigerant pipe for an air conditioner according to claim 1, wherein a flexible tube formed in a bellows shape and a cushioning material are provided without a gap and are in close contact with each other. 4. A flexible tube formed in a bellows shape and a space between the outer side of the flexible tube and a sleeve of an elastic body which is concentrically arranged outside the flexible tube are lower than the outer sleeve of the elastic body. The refrigerant pipe for an air conditioner according to claim 1, wherein a cushioning body made of an elastic member is provided and closely attached without any gap. 5. A buffer body is tightly provided in a clearance space between a flexible tube formed in a bellows shape and a sleeve of an elastic body that is concentrically arranged outside the bellows tube with no clearance. A refrigerant pipe for an air conditioner, characterized in that a reinforcing mesh is provided inside or on the outer peripheral portion of the elastic member. 6. The refrigerant pipe for an air conditioner according to claim 5, wherein a cushioning material made of a low-elasticity member is provided tightly to the outer elastic sleeve so as to be in close contact therewith. 7. The refrigerant pipe for an air conditioner according to claim 5, wherein the sleeve has a rectangular cross section and has elastic directionality. 8. An air conditioner in which a flexible pipe is connected in series in the middle of a refrigerant pipe connected between a compressor and a switching valve, and a flexible pipe formed in a bellows shape and an outside thereof. A cushioning material is provided tightly and closely in a clearance space between the elastic body sleeve having a rectangular cross section and a space, and the sleeve has an elastic directional property. Refrigerant piping for air conditioners. 9. When brazing and welding a flexible tube and a refrigerant pipe connected to this flexible tube, a ring-shaped brazing material is fitted and mounted in the flexible tube, and this end is connected to the flexible tube. After inserting and connecting the brazing material to the end of the refrigerant pipe and fixing it, braze welding is performed by high-frequency brazing while ejecting an inert gas into the refrigerant pipe, and air is ejected into the refrigerant pipe after brazing welding is completed. A method for manufacturing a refrigerant pipe for an air conditioner, comprising: